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Top rated locknuts
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Best overall HillmanHillman 121006 3/8-16 Zinc Plated Hex Lock Nut
Widely compatible with standard bolts, durable zinc plating resists corrosion
- Affordable bulk packs
- Reliable locking action
- Wide size availability
- Not for high-vibration applications
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Best nylon insert VifmyCrown Bolt 10006 1/4-20 Nylon Insert Lock Nut
Nylon insert provides consistent friction and resists loosening under moderate vibration
- Reusable multiple times
- Good for frequent disassembly
- Secure grip
- Nylon may degrade over time
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Best budget pick BNUOKPittsburgh 3/8-16 Nylon Insert Lock Nut (20-Pack)
Low cost while maintaining effective locking performance for light to medium duty
- Very economical
- Decent lock retention
- Thinner material
- Not for heavy loads
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Best heavy-duty Hard-to-Find FastenerGrainger 2H 3/4-10 Heavy Hex Lock Nut
Class 2H heavy hex design ideal for high-stress industrial bolting applications
- High strength (Grade 8 equivalent)
- Excellent temperature tolerance
- Expensive
- Limited sizes
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Best all-metal HillmanFastenal Grade 8 3/8-16 All Metal Lock Nut
Prevailing torque all-metal nut for high temperature and high vibration environments
- No nylon to melt or wear
- Reusable without loss of torque
- High reliability
- Requires more torque to install
- More expensive than nylon insert
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Best for general use MAKERS BOLTEverbilt 3/8-16 Zinc-Plated Nylock Nut (25-Pack)
Good value with corrosion-resistant finish and nylon insert for secure fastening
- Good balance of cost and performance
- Common sizes available
- Zinc finish average protection
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Best bulk value uxcellUxcell 5/16-18 Nylon Insert Lock Nut (50-Pack)
Large pack suitable for projects requiring many lock nuts at a low per-unit price
- Very low cost per piece
- Consistent quality
- Nylon insert not as snug
- Packaging not durable